<?php
/**
 * Created by zh.
 * File_name: Security.php
 * Date: 2015/5/20
 */

namespace Common\Util;



class Security {
//    private static $key = 'U93pQWO12UevhoIYC';
    public static function getEnrypt($val,$key=''){
        $key = strtotime($key);
        return $val ? md5(self::encrypt($val,$key)) : '';
    }
    /*加密*/
    public static function encrypt($input,$key) {
        $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);

        $input = Security::pkcs5_pad($input, $size);

        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
        $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        mcrypt_generic_init($td, $key, $iv);
        $data = mcrypt_generic($td, $input);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);

        $data = base64_encode($data);
        return $data;
    }

    private static function pkcs5_pad ($text, $blocksize) {
        $pad = $blocksize - (strlen($text) % $blocksize);
        return $text . str_repeat(chr($pad), $pad);
    }

    public static function decrypt($sStr, $sKey) {
        $decrypted= mcrypt_decrypt(
            MCRYPT_RIJNDAEL_128,
            $sKey,
            base64_decode($sStr),
            MCRYPT_MODE_ECB
        );

        $dec_s = strlen($decrypted);
        $padding = ord($decrypted[$dec_s-1]);
        $decrypted = substr($decrypted, 0, -$padding);
        return $decrypted;
    }
}